Texas reports addition Zika local transmission

In a follow-up to the initial report of local Zika transmission in south Texas early last week, The Texas Department of State Health Services and Cameron County Department of Health and Human Services have identified four additional cases of suspected locally transmitted Zika virus disease in Cameron County.

Aedes aegypti/CDC

The cases were identified as part of the follow up to the state’s first case of Zika likely transmitted by a mosquito in Texas, announced Nov. 28.

The additional patients live in very close proximity to the first case. Though the investigation is ongoing, the infections were likely acquired in that immediate area. They reported getting sick with Zika-like symptoms between Nov. 29 and Dec. 1 and were likely infected several days earlier before mosquito control efforts intensified in that part of Brownsville. None are pregnant women. Testing of people living in an eight-block area around the homes of the identified cases continues but has yet to show any additional evidence of Zika transmission in the rest of that larger area.

“These cases were found through careful public health work and collaboration at the local, state and federal levels,” said Dr. John Hellerstedt, DSHS commissioner, “and we’ll continue to follow through with the investigation and additional surveillance to identify other cases and other places experiencing local mosquito transmission of Zika. That information will be crucial to any future public health guidance.”

It’s also important that health care providers continue to be on the lookout for Zika and pursue testing pregnant women who have traveled to Mexico or other areas where Zika is spreading and testing anyone with symptoms compatible with Zika.

Public health workers from Cameron County and DSHS’ regional office went door to door in the neighborhood last week to provide testing to look for other active Zika infections and educate residents about the illness and how to eliminate mosquito habitats. The education effort ultimately led to the detection of the four additional cases by prompting residents to recognize the symptoms of Zika and contact the health department for testing. Additionally, the City of Brownsville has been spraying for mosquitoes in the vicinity over the last two weeks and has seen a decrease in the number of mosquitoes in the area.

“The combination of mosquito control and colder weather has decreased mosquito activity in Cameron County and greatly decreased the probability of more widespread mosquito transmission of Zika right now,” said Dr. Hellerstedt. “However, winters are mild in southern Texas, and mosquito populations can rebound even during short periods of warmer weather. Whenever you see mosquito activity, protect yourself and your family from bites.”

Prompted by the additional cases, the Texas Health and Human Services Commission is expanding the Medicaid benefit for mosquito repellent beyond Dec. 31 for residents of Cameron County. The benefit was recently brought back with news of the first Zika case likely transmitted locally and is in place statewide through Dec. 31. For Cameron County, the benefit will be in place indefinitely as state health officials collect more information about the scope of transmission in Texas.